Grinding wheel dresser



Dec. 3, 1957 v. BORDONARO 2,815,017

GRINDING WHEEL DRESSER Filed Dec. 7, 1955 s Sheets-Sheet 1 MUU @j 55 55CED/3 4cm 3/ l 10 7'5'4 0 IN Z6 Z3 1 3 VENTOR 7 6 vi g i Bo mi 0 nan;

ATTORNEY Dec. 3, 1957 v. BORDONARO 2,815,017

GRINDING WHEEL DRESSER Filed Dec. 7, 1955 5 Sheets-Sheet 2 Dec.-3, 1957v. BORDONARO 2,815,017

GRINDING WHEEL DRESSER Filed Dec. '7; 1955 3 Sheets-Sheet 3 ATTORNEYUnited States Patent GRINDING WHEEL DRESSER Vincent Bordonaro,Belleville, N. J.

Application December 7, 1955, Serial No. 551,682

11 Claims. (Cl. 125-11) This invention relates to a novel precisioninstrument or mechanism for dressing the periphery and a side or sidesof a grinding wheel or disk.

More particularly, it is an object of the present invention to providean instrument or mechanism for dressing uneven surfaces of a rotarygrinder to any desired shape either straight, angular or curved.

A further object of the invention is to provide a mechanism orinstrument of substantially universal utility in shaping and reshapingabrasive wheels to provide any desired peripheral angle or curvatureeither straight, concave or convex to enable the grinder or a peripheralpart thereof to be utilized for grinding tools, dies and other articleswith extreme accuracy.

Still a further object of the invention is to provide a mechanism theuse of which will enable abrasive wheels to be used and reshaped forfurther use even after having been worn down to an extent where thewheel would normally be disposed of as worn-out, thereby effecting asubstantial saving in replacement of grinding wheels due to use of theinstrument.

A further object of the invention is to provide a precision instrumentwhich may be set by a number of different means thus enabling use of theinstrument by unskilled or partially skilled workers as well as byhighly trained machinists.

Various other objects and advantages of the invention will hereinafterbecome more fully apparent from the following description of thedrawings, illustrating presently preferred embodiments thereof, andwherein:

Figure 1 is a top plan view of the wheel dresser;

Figure 2 is a side elevational view thereof, looking toward theleft-hand side of the wheel dresser;

Figure 3 is a cross sectional view taken substantially along a plane asindicated by the line 3-3 of Figure 2;

Figure 4 is a longitudinal substantially central vertical sectional viewof the wheel dresser, taken substantially along a plane as indicated bythe line 4-4 of Figure 3;

Figure 5 is a fragmentary detailed rear elevational view of a part ofthe mechanism;

Figure 6 is a fragmentary top plan view of the rear end portion of thebase of the wheel dresser;

Figure 7 is a fragmentary detailed horizontal sectional view on anenlarged scale, taken substantially along a plane as indicated by theline 77 of Figure 2;

Figure 8 is a fragmentary detailed vertical sectional View, takensubstantially along a plane as indicated by the line 8-8of Figure 7;

Figure 9 is a fragmentary front elevational view of one part of thewheel dresser;

Figure 10 is a fragmentary top plan view of the wheel dresser shown inconjunction with a grinding Wheel being refinished thereby andillustrating different positions of the wheel dresser parts in full anddotted lines relative to the grinding wheel;

Figure 11 is a side elevational view, partly in vertical section,illustrating another form of diamond for use with thedresser;

2,815,017 Patented Dec. 3, 1 957 Figure 12 is a top plan view of thediamond as shown in Figure 11, and

Figure 13 is a fragmentary detailed horizontal sectional view, takensubstantially along a plane as indicated by the line 13-13 of Figure 2.

Referring more specifically to the drawings, the novel wheel dresser inits entirety and comprising the invention is designated generally 15 andincludes an elongated base 16 having a flat underside 17 which isadapted to rest upon a flat horizontal surface. The base 16 has ad0vetail shaped recess extending from end to end thereof, as seen at 18in Figure 3, which opens through the top of the base 16. A gib 19 formsone side of the dovetail groove 18 and is secured in the base 16 byscrew fastenings 20. The gib 19 is provided'with a transverse bore 21intermediate of its ends to receive a plug 22, as seen in Figure 13, theinner face of which conforms in shape to the inner face of the gib 19. Aclamping screw 23 is threaded inwardly through a side of the base 16 andhas an inner end abutting the outer end of the plug 22. The groove 18opens outwardly of the forward end of the base 16 and is closed at itsrear end by an upstanding wall member 24 which is detachably fastened tothe rear end of the base 16 by fastenings 25, as seen in Figure 5.

An elongated slide 26 is disposed on the top surface of the base 16 andhas a dovetail shaped member27 secured to its underside andlongitudinally thereof and which slidably engages in the dovetail groove18. An unthreaded shank portion 28 and a collar 29 thereof arejournalled in the upper portion of the wall 24 in an opening 30 of saidwall, as seen in Figure 4. The shank 28 extends outwardly from the walland has a turning knob 31 secured thereto by a pin 32. The knob 31cooperates with the collar 29 to prevent the shank 28 from movinglongitudinally of the base 16. A feed screw 33 extends inwardly from theinner side of the collar 29 and threadedly engages a threaded bore 34which opens outwardly of the rear end of the slide 26. The forward. endof the slide 26 is provided with laterally spaced upstanding abutmentmembers 35 each of which has a groove 36 to swingably accommodate an endof a bar forming an angle stop 37. Said inner ends of the angle stops 37are pivotally mounted in the recesses 36 by clamping screws 38 which areadapted to be tightened for securing the angle stops 37 immovablyrelative to the abutments 35 and in various angularly adjustedpositions. A plate 39 is mounted on the upper surface of the forward endof the slide 26 between the abutments 35, and the upper surface thereofis inscribed with degree markings and graduations, as seen at 40 inFigure 1, which extend from the concavely bowed inner or rear edge 41 ofsaid plate 39. The lower end of a bushing 42 is secured, as by a pressfit engagement, in an opening 43 of the slide 26 which is disposedadjacent to but spaced from the forward end of said slide and centrallywith respect to the longitudinal axis of the slide and base. Said innerplate edge 41 is disposed concentrically with respect to the axis of thebushing 42. It will thus be seen that the slide 26 including the partscarried thereby is movable by rotation of the knob 31 relative to thebase 16 only in a direction longitudinally of said base. i

A swivel base 44 has a forward end portion provided with a vertical bore45 which fits turnably around the bushing 42. Said forward portion ofthe base 44 has a fiat underside 46 which is supported swivelly on theupper side of the forward portion of the slide 26. A bushing 47 turnablyfits in the bushing 42 and has a flanged upper end 48 which is securedby fastenings 49 to the upper surface of the forward end of the base 44.Said base 44 has an upwardly facing shoulder 50 which is disposedconcentrically around the opening 45 thereof and above and adjacent saidbottom surface 46. A screw 51 is a threaded into the top of the slide 26and a part of the head of said screw overlies a portion of the shoulderto detachably retain the base 44 swivelly on the slide 26. The base 44is arcuately' grooved as seen at 52 in Figure 4 to accommodate the headof the screw 51 when said base is rotated about the axis of the bushing42. The rear portion of the base 44 is provided with an elongated slot53 which opens outwardly of the upper side thereof. A feed screw 54 isturnably disposed in the slot 53 and extends threadedly through a nut 55which is disposed for movement in the slot 53 longitudinally of the base44. The feed screw 54 has a shank portion 56 a forward part of which isnonslidably journalled in an opening 57 in the rear end of the base 44and a rear end of which is disposed in and detachably secured to anelongated knob 58.

A slide 59 is mounted on the rear end portion of the base 44 and isslidably connected thereto by a dovetail connection 60, as seen inFigure 3, for sliding movement of the slide 59 only in a directionlongitudinally of the base 44. The dovetail connection 60 includes a gib61 and a clamping screw 62. The screw 62 is threaded laterally into theslide 59 from one side thereof against the outer side of the gib 61 sothat by advancing the screw 62 the gib 61 will be advanced inwardly toclamp the slide 59 immovably to the base 44. The nut 55 has a projection63, as seen in Figure 4, which extends upwardly into a downwardlyopening recess 64 of the slide 59 and which receives a screw fastening65 for securing the nut 55 to the slide 59. The swivel base 44 and slide59 form a compound.

A disk or plate 66 is mounted on the upper side of the slide 59 and hasa depending central boss 67 which is received in an upwardly openingrecess 68 of the slide 59 and which partially overlies the head of thefastening 65. The plate 66 is secured on the slide 59 by a screwfastening 69 which extends downwardly through said plate and is anchoredin the slide. A pin 70 engages aligned openings 71 of the plate 66 andslide 59 and can only be applied when said openings are in alignment, soas to correctly index the plate 66 and the structure supported therebywith respect to the longitudinal axis of the base 44.

An arch shaped supporting member 72 is mounted on and secured immovablyto the plate 66. An elongated guide bar 73 of dovetail shape in crosssection is secured crosswise to the upper side of the member 72 by screwfastenings 74. A cross slide 75 is slidably mounted on top of the archmember 72 and includes a downwardly opening recess 76 of dovetail crosssection, partially formed by a gib 77. The cross slide 75 has a post 78fixed to and rising perpendicularly therefrom and which terminates atits upper end in a sleeve 79. The axis of the sleeve 79 is disposedcrosswise to the axis of the post 78 or in a horizontal plane. A tubulardiamond holder 80 extends slidably through the sleeve 79 and a diamondnib 81 is adjustably secured in the holder 80 by a setscrew 82. Thepoint or tip 83 of the diamond nib is disposed beyond a forward end ofthe holder 80 adjacent to which the setscrew 82 is mounted. A stem 84 ismounted in the other rear end of the holder 80 and has a conical endprojecting therefrom and which terminates in a point 85 which isdisposed in alignment with the axis of the holder 80. Said rear end ofthe holder 80 is defined by an annular flange 86 which functionsin'cooperation with a fixed plug 87 which is secured in and projectsoutwardly from the sleeve 79.

A feed screw 88 is threaded crosswise through the post 78 below thesleeve 79 and has a relatively large disk shaped head- 89 at one endthereof which loosely engages selectively in one of a pair of downwardlyopening transverse grooves 90 of the holder 80 and which are locatedadjacent said flanged rear end 86, as best seen in Figure 4.

As best illustrated in Figure 1, a key 91 is adjustably mounted radiallyin the sleeve 79 and has an inner end projecting into the sleeve boreand slidably engaging a longitudinal groove 92 of the holder 80 toprevent turning of said holder in the sleeve 79. As best seen in Figure3, a stop or clamping member 93 fits slidably and turnably in atransverse recess 94 which opens outwardly of one side of the post 78and which communicates with a part of the interior of the sleeve 79. Athreaded stem 95 projects from the inner end of the clamping member 93and threadedly engages a bore 96 of the post 78. Thus, by turning themember 93 in one direction, said member will be drawn inwardly of thepost 78 and into clamping or wedging engagement with the holder 80 toprevent movement of said holder in the sleeve 79. By turning the member93 in the opposite direction the holder 80 is released so that saidholder and the diamond nib 81 may be moved longitudinally of the sleeve79 by the rotation of the feed screw 88.

A rack 97 is secured by fastenings 98 to the outer side of one leg ofthe arch 72 with the teeth thereof facing upwardly and disposed parallelto the longitudinal axis of the dovetail element 73. A stub shaft 99 isdetachably secured to and projects laterally from the cross slide 75 toprovide a journal for a pinion 100 and a handwheel 101 which areintegrally connected by a sleeve 102 and which parts are retainedrotatably mounted on the stub shaft 99 by a fastening 103, with thepinion 100 disposed to mesh with the teeth of the rack 97. A cover 104which is detachably supported on and carried by the slide 75, as bestseen in Figures 1 and 2, protects the teeth of the pinion 100 and rack97 from dirt and dust.

As best seen in Figures 3, 7 and 8, a bar 105 is secured to the upperside of the cross slide 75 and has a pair of upstanding transverselyspaced ears 106 at one end thereof, one of which is provided with anoutwardly projecting extension forming a latch keeper or detent 107. Apin 108 extends through the ears 106 and loosely through theintermediate portion of a lever 109 which is thus supported for verticalrocking movement and for limited sliding movement between the ears 106toward and away from the keeper 107. The bar 105 is provided with anupstanding housing 111 which opens downwardly therethrough and whichaligns with a vertical bore 110 of the slide 75. The housing 111 isspaced longitudinally from the ears 106 and has an elongated opening111a in the side thereof facing toward said ears. A pin 112 is slidablydisposed in the bore 110 and has an enlarged hollow head 113 whichslidably and nonrotatably fits in the housing 111 and in which isloosely received an end 114 of the lever 109. The dovetail element 73 isprovided with an upwardly opening recess 115 which registers with thebore 110, in one position of sliding movement of the slide 75 relativeto the element 73 and in which position the lower end of pin 112 isreceivable in the recess 115 to latch the slide 75 immovably to theelement 73. A spring 116 is mounted in the upper part of the housing 111and urges the pin 1 12 downwardly to engage in the recess 115 when thebore 110 moves into registration therewith. When the slide 75 is latchedby the pin 112, as illustrated in Figures 3 and 8, said slide 75 isdisposed so that the horizontal axis of the diamond nib 81 intersectsthe vertical axis of the bushings 42 and 47, for a purpose which willhereinafter be described. By pressing down on the other, outer end 117of the lever 109, as illustrated in dotted lines in Figure 8, said leverwill be rocked to substantially a horizontal position for elevating thepin 112 out of engagement with the recess 115 so that the slide 75 andparts carried thereby may be moved crosswise of the compound base 44 andslide 59 in either direction by rotation of the handwheel 101. Also, bydisplacing the lever end 117 laterally as illustrated in Figure 7, saidend 117 can be engaged under the keeper 107 for maintaining the pin 112in an elevated position so that unobstructed translational movement ofthe cross slide 75 and parts carried thereby may be accomplished. Bymerely displacing the lever end 117 back to its full line position ofFigure 7, the parts will be disposed so that when the bore 110 movesinto alignment with the recess 115 the pin 112 will be projected by thespring 116 into engagement with the recess 115 for automaticallylatching the cross slide immovable relative to the element 73, aspreviously described. The bar 105 and the parts associated therewith,except the lever end 117, are protected from dust and grit by a cover118 which is mounted detachably on the cross slide 75.

Headed screws 119, as seen in Figures 2 and 5, are threaded into thesides of the base slide 26 adjacent the rear end thereof. Each of thescrews 119 extends loosely through an end of a retaining bar 120, whichbars are thus swingably supported on the screws. The bars 120 can beswung upwardly, as illustrated in Figures 2 and 5, against portions ofthe sides of the base 44 to retain said base and the parts supportedthereon against swinging movement about the axis of the bushings 42 and47. By loosening the screws 119 the retaining bars 120 can be swungdownwardly and forwardly to permit the base 44 to be swung about thebushing 42 in either direction, utilizing the knob 58 as a handle. Itwill also be apparent that one of the retaining bars 120 may bemaintained in an upright position while the other bar 120 is releasedand swung downwardly, in which case the compound may be swung back andforth in one direction only from its position of Figure 1 and whereinthe longitudinal axis thereof is disposed in vertical alignment with theaxis of the base 16.

A stop pin 121 is fixed to and extends upwardly from a forward portionof the base 44. An elongated gauge member 122 has a lower end portion123 of circular cross section and tapered to conformably engage in adownwardly tapered bore 124 of the bushing 47. A pin 125 is fixed to andextends laterally from the gauge 122 above and adjacent its tapered end123. When the gauge end 123 is positioned in the bore 124, the gauge isrotated clockwise as seen in Figure 1 until the pin 125 moves intoengagement with the stop 121. When the gauge 122 is so disposed, avertically disposed flat surface 126 of the upper portion of the gauge122 will be disposed exactly crosswise of the longitudinal axis of thecompound and of the diamond nib 81 and the longitudinal or verticalcenter 127 of the surface 126, as seen in Figure 1, will be exactly inalignment with the axis of the bushings 42 and 47. Thus, the gaugemember 122 provides a very efficient and accurate means for setting thepoint 83 of the diamond nib relative to the axis of rotation of theparts forming the compound and by which the diamond is carried.

In utilizing the dresser 15 for dressing a grinding wheel, the basebottom surface 17 is placed upon a horizontal fiat supporting surface,not shown, of a worktable which is disposed beneath a grinding wheel, aportion of which is shown in Figure and designated generally 128. Adriven shaft or arbor 129 of the wheel 128, which is disposed in ahorizontal plane, is adjusted vertically until its axis is disposed atthe same level as the axis of the diamond nib 81. This setting of thearbor 129 may be accurately accomplished by utilizing the point 85 toengage in the conically recessed end 130 of the arbor. The dresser isthen positioned as seen in Figure 10 with its longitudinal axis disposedin alignment with the plane of the grinding wheel 128 and crosswise tothe axis of the arbor 129. During the aforementioned procedure, thediamond setting gauge 122 is removed from the dresser and the bushingsare covered and protected from grit and dust by a cover 131, as seen indotted lines in Figure 2, which is detachably secured in place by a pairof retaining screws 132 which are threaded downwardly into the forwardend of the slide 59.

With the dresser disposed as illustrated in Figure 10 relative to thewheel 128, the dresser is initially employed to dress the periphery ofthe wheel and at least an outer portion of one side thereof. Theretaining bars 120 are secured in upwardly extending positions toprevent swinging movement of the base 44 and so that the diamond nib 81will be maintained at exactly a right angle to the arbor 129 and withthe axes of the diamond nib and arbor at the same level. The knob 58 isthen turned in a direction to cause the slide 59 and the parts carriedthereby to be advanced forwardly by the feed screw 54 and. nut 55 untilthe diamond point 83 contacts the periphery of the wheel 128. The latchpin 112 is then latched in a raised position by moving the lever 109 toits dotted line position of Figure 7 after which, while the wheel 128 isrevolved, the handwheel 101 is manually turned in one direction and thenthe other for causing the diamond point 83 carried by the cross slide 75to move back and forth across the wheel periphery to dress the peripheryto a true flat surface. The cross slide is then relatched by the pin 112after which one of the retaining bars 120 is released and swungdownwardly so that the base 44 can be grasped by the handle 58 and swungthrough an arc of about the bushing 42 to its dotted line position ofFigure 10, for example, in which position a portion of one vertical sidewall of the base 44 is disposed in abutting engagement with a rearwardlyfacing surface 35a of one of the abutments 35, so that the longitudinalaxis of the base 44 and the diamond nib 81 are then disposed parallel tothe arbor 129 and substantially perpendicular to the sides of the wheel128. The knob 58 is then turned, as previously described, to advance thediamond point 83 into engagement with the adjacent side of the wheel128, since the knob 58 will have been previously turned for backing offthe diamond nib 81 to enable the diamond point to clear the corner ofthe wheel periphery. The latch pin 112 is then released and with thewheel 128 revolving, the handwheel 101 is turned to cause the diamondpoint 83 to move back and forth radially in contact with a side of thewheel 128 to square said side with respect to the Wheel periphery. Theside of the wheel will thus be dressed to the periphery and inwardly asfar as desired. If in the subsequent shaping of the wheel periphery,portions of both sides of the wheel 128 are utilized, the other side orface of the wheel will be dressed in the same manner as previouslydescribed.

Assuming now that it is desired to set the dresser 15 to dress a convexradius of one-eighth of an inch on the wheel 128, the dresser 15 isreturned to its position of Figures 1 and 2 and is latched in saidposition by the retaining bars and the pin 112. The cover 131 is thenremoved and the gauge 122 is applied and positioned as illustrated inFigures 1 to 3 and as previously described. The diamond nib 81 may thenbe accurately set for cutting the one-eighth inch convex radius in anyone of three ways. This can be accomplished by placing a oneeighth inchconventional gauge block against the fiat surface 126, after which withthe clamping member 93 loosened the screw 88 may be turned for advancingthe holder 80 and diamond nib 81 until the gauge block has a slip fitengagement between the surface 126 and diamond point 83. The clamp 93 isthen tightened to clamp the holder 80 and diamond nib 81 thuspositioned. The diamond setting gauge 122 can then be removed afterwhich the cover 131 is replaced and with one of the bars 120 releasedand swung downwardly, the compound may be swung about the axis of thebushing 42 between the full and dotted line positions thereof as seen inFigure 10 for grinding a one-eighth inch convex radius on one side edgeof the periphery of the wheel 128. It will be understood that the anglestops 37 or at least one thereof is swung outwardly and forwardlywhenever the compound is swingably moved, as seen in Figure 10.

A second way of accomplishing this same setting of the diamond nib 81 isby bringing the diamond point 83 up to engagement with the surface 126,after which the distance between the front surface of the plug 87 andthe back surfaceof the flange 86 is measured with a micrometer. p Theone-eighth or .125 inch is then added to this measurement after whichwith the clamp 93 loosened the screw 88 is turned to displace the holder80 and diamond nib 81 away from the vertical face 126 until thismeasurement is obtained.

Another, third way of setting the diamond nib 81 is by bringing thediamond point 83 into contact with the vertical face 126. The zerograduation of a verm'er slide plate 134, as seen in Figure 2, is thenpositioned in alignment with the zero graduation of a double linearscale 135 located on one side of the base 44. The Vernier slide 134 isslidably carried by a side wall of the slide 59 and is connected theretoby a tongue and groove connection 136, as seen in Figure 3. The slide134 is secured in its different adjusted positions by tightening thescrews 137 whereby the bottom portion of a clamping plate 138 is drawninwardly into clamping engagement with the slide 134. After the zeroline of the Vernier of the slide 134 is aligned with the zero graduationof the scale 135, the diamond point 83 is backed away from the surface126 by turning the knob 58 until a .125 inch reading is obtainedutilizing the Vernier scale and the rear or righthand portion of thescale 135. It will be obvious that the last described form of settingthe diamond point requires greaterskill than the first or second method.The first or simplest method can be performed with accuracy by anapprentice or a relatively unskilled worker.

The dresser may be set for cutting a one-eighth inch concave radius, forexample, by bringing the diamond point up to the flat surface 126 afterwhich the distance between the front side of the plug 87 and the rearside of the flange 86 is measured with a micrometer. The gauge 122 isthen removed, after which one-eighth of an inch is subtracted from themicrometer reading or measurement. The feed screw 88 is then turned toadvance the diamond nib forwardly until the measurement between thefront surface of the plug 87 and the rear surface of the flange 86corresponds to the new setting or reading of the micrometer. is advancedone-eighth of an inch past or forwardly of the axis of the bushing 42,so that the dresser will then cut a concave rather than a convex radius.

Again assuming that the diamond point has been set to a zero reading aspreviously described and that the gauge 122 has been removed, thevernier scale of the slide plate 134 is zeroized with respect to thescale 135, after which the knob 58 may be turned for advancing thecompound until a reading of .125 inch is obtained with the Vernier scaleand the forward or left-hand portions of the linear scale 135. Fordressing a concave radius, a diamond nib 81a having a diamond point 83ais preferably substituted in the holder 80, as illustrated in Figure 11,for the diamond nib 81.

Assuming that it is additionally desired to dress the wheel periphery byswingably moving the compound through a 90 angle in addition to a convexor concave radius the diamond point is initially set in the same manneras previously described. The compound is then swung counterclockwise asseen in Figure 1 until an angular reading of is obtained utilizing thezero graduation of the scale-40 of the plate 39 and the angle scale 139which is inscribed on the upper surface of the annular flange orshoulder and on the arcuate front face of the base 44, as seen inFigures 1 and 9. With the compound thus disposed at a 45 angle, theangle stop 37, toward which the compound is swung, is swung rearwardlyand inwardly into engagement with a side wall of the base 44, afterwhich the pivot screw 38 of said angle stop 37 is tightened for clampingthe angle stop immovably relative to its abutment 35. The same procedureis then repeated for setting the other angle stop 37, after which thecompound may be swung back and forth betweentheangle stops for dressingthe periph yp the wheel 128 to a one-eighth inch convex radius. The

In this way, the point of the diamond compound is then held at a 45angle with one side of its base 44 abutting one of the stops 37, afterwhich the latch pin 112 is released and the cross slide 75 is actuatedby turning the handwheel 101 to cause the diamond point to cut one sideof the periphery of the wheel at an angle of 45 to the plane of thewheel. The same operation is then repeated with the base 44 engaging theother angle stop 37 so that 45 angles will thus be cut on both sides ofthe wheel 128.

As seen in Figure 2, one side of the base 16 is provided with a linearscale 1411 and the complementary side of the slide 26 has a zerograduation or marking 141 to be utilized with the scale 141).Additionally, the knob 31, by which the slide 26 and all of the partsdisposed thereabove are moved longitudinally relative to the base 16, isprovided with micrometer graduations 142 employed with a zero line 143,as seen in Figures 5 and 6, which is inscribed on the wall 24. Twocomplete revolutions of the knob 31 moves the slide 26 a tenth of aninch or a distance equal to the spacing between two adjacent graduationsof the scale 140. Thus, utilizing the scale in combination with themicrometer scale 142, the slide 26 and parts supported thereabove may beaccurately advanced to position the diamond point for cutting a concaveradius at any desired depth in the periphery of the wheel 128.

From the foregoing it will be readily apparent that the dresser 15readily adapts itself to any dressing operation or combination ofdressing operations to be performed on a rotary grinding or abrasivewheel or disk. It is also to be understood that the adjustmentsdescribed are merely intended to illustrate a few of the most commondressing operations performed.

Various modifications and changes are contemplated and may obviously beresorted to, without departing from the spirit or scope of the inventionas hereinafter defined by the appended claims.

I claim as my invention:

l. A grinding wheel dresser comprising an elongated base defining thebottom portion of the dresser, a diamond holder constituting the topportion of the dresser, a diamond nib supported in said diamond holderand having the axis thereof disposed in a horizontal plane parallel tothe plane of said base, a compound mounted on the base and supportingthe diamond holder, means swivelly connecting the compound to the basefor mounting said diamond nib for swinging movement in a horizontalplane about the axis of said swivel means, manually actuated meansengaging said diamond holder for effecting a reciprocating movement ofthe holder and diamond nib toward and away from an extension of the axisof said swivel means for varying the spacing of the forward end or pointof the diamond nib from said axis extension in a direction rearwardlywith respect to the dresser for varying the convex radius of an aredescribed by the diamond point when the compound is oscillated on thebase, said compound including a swivel base connected to a forwardportion of the dresser base by said swivel means, a slide supported onthe swivel base behind said swivel means, and feed means connecting theslide and swivel base for moving said slide and diamond holder as a unitin a direction toward and away from the axis of said swivel means andwhereby the diamond point is capable of being advanced in a forwarddirection across the axis of said swivel means to assume a position fordescribing a concave are when the compound is rotated about said swivelmeans, said swivel base being horizontally elongated, said swivel meansengaging the swivel base adjacent a forward end thereof, and a crossslide mounted above and supported by the first mentioned slide formovement in a direction crosswise of the longitudinal axis of thecompound base and diamond holder,'said diamond holder and diamond nibbeingsupported-for movement with the cross slide sponding to thelongitudinal axis of the compound, and

manually actuated means for releasably retaining said latch means in areleased position to permit sliding movement of the cross slide relativeto the compound.

2. A grinding wheel dresser as in claim 1, and manually actuated rackand pinion means for imparting translational motion to the cross slidein directions crosswise of the compound.

3. A grinding wheel dresser comprising an elongated base defining thebottom portion of the dresser, a diamond holder constituting the topportion of the dresser, a diamond nib supported in said diamond holderand having the axis thereof disposed in a horizontal plane parallel tothe plane of said base, a compound mounted on the base and supportingthe diamond holder, means swivelly connecting the compound to the basefor mounting said diamond nib for swinging movement in a horizontalplane about the axis of said swivel means, manually actuated meansengaging said diamond holder for efiecting a reciprocating movement ofthe holder and diamond nib toward and away from an extension of the axisof said swivel means for varying the spacing of the forward end or pointof the diamond nib from said axis extension in a direction rearwardlywith respect to the dresser for varying the convex radius of an aredescribed by the diamond point when the compound is oscillated on thebase, said swivel means having a centrally disposed upwardly openingsocket, an elongated diamond setting gauge member having a lower enddetachably fitting into the socket of said swivel means, said gaugemember having an upper portion provided with a fiat surface disposed ina vertical plane and having a vertically extending central portiondisposed in alignment with the axis of said swivel means and extendingfrom below to above the level of the diamond nib axis, and means fororienting said flat surface relative to the compound whereby saidsurface is disposed at a right angle to the diamond nib axis and facingrearwardly toward the diamond point.

4. A grinding wheel dresser as in claim 3, said compound including aswivel base connected to a forward portion of the dresser base by saidswivel means, a slide supported on the swivel base behind said swivelmeans, feed means connecting the slide and swivel base for moving theslide and diamond holder as a unit toward r and away from the axis ofthe swivel means and whereby the diamond point is capable of beingadvanced in a forward direction across the axis of said swivel means toassume a position for describing a concave are when the compound isrotated about said swivel means, and a linear scale associated with theswivel base and slide and functioning with said gauge member foraccurately setting the diamond point at a predetermined distance from anextension of the axis of the swivel means.

5. A grinding wheel dresser as in claim 4, transversely spaced abutmentmembers fixedly supported on the forward end of the dresser base andhaving coplanar rearwardly facing surfaces disposed to be selectivelyengaged by side walls of the swivel base for positioning thelongitudinal axis of the compound and diamond nib at a right angle tothe longitudinal axis of the dresser base.

6. A grinding wheel dresser as in claim 5, said compounds beinghorizontally elongated, an angle stop member carried by each of saidabutment members, means swingably connecting said angle stop members tosaid abutment members for swinging movement of the angle stop members inhorizontal planes, said last mentioned means being manually adjustablefor clamping said angle stop members immovably to the abutment members,and said dresser base and swivel base having graduations combining toform a degree scale for angulanly adjust- 1G ing the compound relativeto the dresser base for setting said angle stops whereby the axis ofsaid compound and diamond nib may be accurately maintained at a desiredangle relative to the axis of the dresser base.

7. A. grinding wheel dresser as in claim 6, said dresser base comprisinga bottom section and a top section constituting a slide and to whichslide the swivel base is connected by said swivel means, tongue andgroove means forming a dovetail connection between said dresser basesections for sliding movement of the upper slide section in directionslongitudinally only with respect to the lower base section, and manuallyactuated feed screw means for moving the slide section of the dresserbase and the parts supported thereabove longitudinally with respect tosaid bottom section of the base.

8. A grinding wheel dresser comprising an elongated base defining thebottom portion of the dresser, a diamond holder constituting the topportion of the dresser, a diamond nib supported in said diamond holderand having the axis thereof disposed in a horizontal plane parallel tothe plane of said base, a compound mounted on the base and supportingthe diamond holder, means swivelly connecting the compound to thebasefor mounting said diamond nib for swinging movement in a horizontalplane about the axis of said swivel means, manually actuated meansengaging said diamond holder for effecting a reciprocating movement ofthe holder and diamond nib toward and away from an extension of the axisof said swivel means for varying the spacing of the forward end or pointof the diamond nib from said axis extension in a direction rearwardlywith respect to the dresser for varying the convex radius of an aredescribed by the diamond point when the compound is oscillated on thebase, a cross slide interposed between said compound and diamond holder,and means slidably connecting the cross slide to the compound formovement of the cross slide, diamond holder and diamond nib indirections at right angles to the axis of the diamond, and springprojected latch means carried by the cross slide for automaticallylatching the cross slide immovable relative to the compound and with anextension of the axis of the diamond disposed to intersect an extensionof the axis of said swivel means.

9. A grinding wheel dresser as in claim 8, and manually actuated meanscarried by the cross slide and engaging said rlatch means for moving andretaining the latch means in an inoperative position.

10. A grinding wheel dresser as in claim 9, a rack fixed to a part ofsaid compound, and a manually actuated pinion rotatably supported on thecross slide and meshing with said rack for translationally moving thecross slide and diamond relative to the compound and in directionslaterally thereof.

11. A grinding wheel dresser comprising an elongated base defining thebottom portion of the dresser, a diamond holder constituting the topportion of the dresser, a diamond nib supported in said diamond holderand having the axis thereof disposed in a horizontal plane parallel tothe plane of said base, a compound mounted on the base and supportingthe diamond holder, said compound including an elongated bottom section,means swivelly connecting the forward end of the bottom section of thecompound to a forward end of the base for swinging movement of thediamond nib about the axis of said swivel means, said compound includingslides interposed between said bottom section and diamond holder atright angles to one another, manually actuated feed means individual tosaid slides for selectively reciprocating the slides for moving thediamond holder in directions both crosswise and parallel to the axis ofthe diamond nib, said dresser base including a top section constitutinga slide to which said bottom section of the compound is connected bysaid swivel means, and tongue and groove means mounting said top sectionof 1 l; the dresser base for sliding movement in directionslongitudinally only relative to the axis of the dresser base for movingthe compound as a unit in directions longitudinally of the dresser base.

References Cited in the file of this patent UNITED STATES PATENTS1,994,386 Dardani Mar. 12, 1935

